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OPTICAL SENSOR DEVICE

  • US 20140070077A1
  • Filed: 11/19/2013
  • Published: 03/13/2014
  • Est. Priority Date: 05/20/2011
  • Status: Active Grant
First Claim
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1. An optical sensor device comprising:

  • a light emitter configured to periodically emit light at a predetermined frequency toward a measurement target;

    a light receiver configured to detect at least one of reflected light and diffused light from the measurement target, and to output an electrical signal based on the detected light;

    a filter circuit configured to modulate the electrical signal at the predetermined frequency and to output a modulation signal;

    an amplifier configured to amplify the modulation signal;

    an AD converter configured to convert the modulation signal to a digital signal; and

    an arithmetic processing unit coupled to the AD converter and configured to calculate a DC component and an AC component of the electrical signal based on the digital signal.

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